Coating apparatus



Aug. 4, 1936. J. J. BoAx ET A1.

COAT ING APPARATUS Filed Marcha 26, 1935 4 Sheets-Sheel'l 1 Y Y. N.

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COAT ING APPARATUS Filed March 26, 1955 4 Sheets-Sheet 2 4 w lweidos: JOHN J 50,43 and JOHN H. M/LLEE.

Aug. 4, 1936. J. J. BOAX ET A1. 2,050,036

COATING APPARATUS Filed March 26, 1935 4 Sheets-SheetI 5 [Mey/dons'. JOHN J. 50,43 und JOHN ,4. /V/LLEE.

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Aug, 4, i930. J, J. BOAX Ty 2,050,036

COATINQ AFPRATUS Filed March 2e, 1955 4 sheetss119504 ma /M L lizvezfos JOHN .f @Gaye/and JOHN 4. M/LEE Patented Aug. 4, 1936 UNITED STATES lPATENT OFFICE 2,050,036 coA'rlNG APPARATUS Application March 26, 1935, Serial No. 13,134

3 Claims.

This invention relates to a coating apparatus and more particularly one which is adapted for 'applying a liquid coating medium to the outer surface of cylindrical objects such as pipes, tubes,

5 bars, wires and the like.

It is one of the objects of the present invention to provide a novel coating apparatus of the class described which will rapidly and automaticallyl apply a uniform lm of coating material on the outer surface of the object, and one which is at the same time susceptible to rapid adjustment over a relatively wide range of sizes.

Another object is the provision of an apparatus of the class described which enables the complete 16 removal of scale and foreign matter from the Work-piece before the coating medium is applied, thus presenting a clean surface to which it readily adheres, and eliminating lumps and pimples, which are encountered when using the devices of 20 the prior art.

A further object is to provide a novel coating apparatus in which its entire working zone is enclosed in such fashion that noneof the coating medium can escape, and at the same time elimihating the fire hazard which is always present if a spray applicator is used.

These and further objects will beapparent after referring to the drawings, in which:v

Figure 1 is a plan of the apparatus of the invention.

Figure 2 is a side elevation.

Figure 3 is an enlarged fragmentary elevation.

Figure 4 is an enlarged sectional elevation.

Figure 5 is a sectional view on the line V-V of Figure 4.

l Figure 6 is an enlarged sectional elevation of a modified form of the invention.

Figure '7 is a sectional detail taken on the line VII-VII of Figure 6.

40 Referring more particularly' to the drawings,

the numeral 2 designates a pair of spaced pedestals which are apertured-in-line, as at 3. A

bearing 4 is disposed in each of the apertures 3 to rotatably support a shaft 5 which extends through and between the pedestals 2. This shaft 5 carries a pair of eccentrics 6, one of which is disposed within each of the pedestals. A vertically slidable block 1 is disposed in each of the pedestals and are each apertured as at 9 to receive one of the eccentrics 6. These vertically siidable blocks 1 carry between them a bed I0 which is provided with a pair of spaced uprights I2, the latter-being apertured-in-line, as at I3. An antifriction bearing I4 is disposed in each of the apertures I3 for rotatably supporting a spindle I5. which is provided with a relatively large central hollow bore I6. This spindle I5 is provided between its bearings I4 with a pair of spaced plates I1 between which there extends a plurality of ribs, as at I8. t Each of the plates I1 carries a 5 plurality of lugs I9 between the ribs I8 which, extend laterally toward the adjacent bearing I4. These lugs I9 are apertured, as at 20, in order that each may carry a radially extending adjusting screw 2|, each of which is provided on its end l0 adjacent the spindle I 5 with a tip, as at 22, which seats in a recess 23 in the latter.

The plates I1 are apertured between each of the lugs I9 and the spindle I5, as at 24, to accommodate one end of a U-shaped trough 25, which l5 opens toward the spindle. Each of these U- shaped troughs 25- carries a lugl 26 on each of its ends which is recessed, as at 21, and apertured in alinement with the adjusting screws 2|, as shown at 28. A nut 29 is disposed in each of the 20 recesses 21 for screw-threaded engagement with each of the adjusting screws 2|.

Referring to Figure 4 of the drawings, it will be readily seen that the adjusting screws 2| may be conveniently manipulated to adjust the radial 25 disposition of the U-shaped troughs 25 with respect to the central bore I6 of the spindle I5. Referring to Figure 5, each of the U-shaped troughs 25 is provided with a. bushing 30 which. seats therein and has on its end adjacent the 30 opening thereof a head 3|. Each of these bushings 30 has a wedge-shaped recess 32. The IJ- shaped troughs 25 are adapted to carry a plurality of brushes 33, the bristles of which are held in a brush socket 34 which carries a wedge-shaped 35 extension 35, the latter seating in the wedgeshaped recess 32 in the bushings 30.

Referring again toFigure 4 of the drawings, the bed I0 carries a motor base 36 to which there is secured an electric motor 31. This electric 40 motor 31 carries on its shaft a pinion 38^which meshes with a gear 39, the latter being secured to an extension 40 on one end of the spindle I5.

One end of the shaft 5 is extended in a similar manner and has secured thereto a Worm gear 4I. 45

.This worm gear 4| is encased in a housing 42 which carries a rotatable shaft 43. This rotatable shaft 43 carries a worm 44 which meshes with the Worm gear 4| on the shaft 5. A hand-Wheel 45 is secured to the shaft 43 for permitting the ro- 50 tation of the worm 44 to impart similarmotion to the shaft 5, and the consequent rotation of the eccentrics 6 toraise the sliding blocks 1 and in this way vertically adjust the disposition of the' bed I0 and accordingly the spindle I5. Thus, 55

the hollow bore I6 of the spindle I5, which forms the line of pass of the Work-piece to be coated, is rendered vertically adjustable to the remainder of the apparatus.

A tank 50 is disposed adjacent one of the pedestals 2 and contains a quantity of liquid coating medium, as at 5|, which may be oil, wax, paint or any other suitable material. The tank 50 is provided with a vertical extension 52 which carries an upper reservoir 53 at a level substantially above the spindle I5 on the adjacent bed I0.

This upper reservoir 53 is furnished with coating medium from 'the tank 50 through a pipe 54 in which there is connected a pump 55 suitably driven by an adjacent motor 56. Upon the energization of the motor 56 coating medium in the tank 50 is pumped to the upper reservoir 53, its level being satisfactorily maintained, as at 58. The upper reservoir 53 is provided with a dispensing chute 59 which carries a plurality of downwardly extending Wires (not shown), in order that the liquid may travel downwardly by capillary action and flow onto the surface of a work-piece progressing through the hollow bore |6 of the spindle 5.

A stand 6| is disposed adjacent the tank 50 and carries a pair of pinch-rolls 62, at least one of which is driven by an adjacently disposed motor 63 to feed the work-piece forwardly.

As shown in Figure 3, an air blast ring 64 is disposed on the side of the stand 6| which is remote from the tank 50 and is so shaped as to provide a line of pass which is of substantially the same size, and in alinement with the pass of the pinch-rolls 62. This air blast ring 61| is supplied With compressed air under suitable pressure through a pipe 55 to clean theentire outer surface of the work-piece of scale, dirt, etc.

A plurality of stands 66 is provided on the side of the air blast ring 64 which is remote from the stand 6| and each carries a conveyor roll 57, some of which are individually driven by adjacent motors 63.

As shown in Figure 1 a stand or rack II is disposed adjacent the stands 59 carrying the rolls 61 to provide storage for a quantity of workpieces X. This permits the Work-pieces to be handily disposed upon the rolls 6l and fed into and through the hollow bore I6 of the spindle I5, receiving on its way a quantity of coating liquid from the wires (not shown) and the dispensing chute 59 of the upper reservoir 53. As the Workpiece is moved through the hollow bore I6 of the spindle I5 the brushes 33 evenly distribute the coating liquid over its length in the form of a film.

A stand 'I2 is disposed adjacent the pedestal 2 which is remote from the tank 50 and carries a pair of pinch-rolls 12e, at least one of which is driven by an adjacently mounted motor 73. A plurality of stands 14 are mounted on the other side of the stand `|I and each is provided with a roll '|5some of which are individually driven by an adjacently disposed motor 16.

A plurality of vertical uprights I8 are disposed adjacent the stands 'I4 and rotatably support a shaft 'I9 which extends in the direction of travel of the work-piece X, although laterally spaced therefrom. This shaft 'I9 is provided 'with a plurality of trip levers which extend between and beneath the line of pass of the rolls 'I5 on the stands 14. As shown in Figure 2, an air cylinder 8| is mounted adjacent a stand 'I4 and Y provided with a linkage 82 in order to partially rotate the shaft 19 and thus, by means of the lieu of the previously described bed |0.

trip levers 80, remove a Work-piece X which may be disposed on the rolls 15, and permit the same to roll transversely onto the stand |8. The air cylinder 82 is operated by the contact of the Workpiece X with a control lever 83 which supplies air to the cylinder 8| through a suitable pipe (not shown).

Referring to Figures 6 and 7 of the drawings, a modified form of the invention is disclosed. According to this embodiment, a bed 99 is disposed upon the sliding blocks 'i in the pedestals 2 in The bed 99 is provided with a pair of spaced uprights 9| which are apertured in alinement as at 92. A bearing 93 is disposed in each of the apertures 92 to rotatably support a pair of alined sleeve sections 99. The alined sleeve sections 94 are provided on their adjacent ends with inwardly extending rings 95 which are connected together in any suitable manner to provide a unitary censtruction. The rings 95 are so formed and connected as to provide a continuous recess 96. Communication into and out of this continuous recess 96 is afforded by means of apertures 91 in the rings 95, which are in alinement with each other.

A sleeve 98 is disposed in each of the apertures 91 in the rings 95 of the sleeve sections Sil, and a shaft 99 is journaled in each pair thereof. A plurality of pinions |00 are disposed in the recess 96 and each secured to one of the shafts 99. An L-shaped bearing section |02 is connected to the outside and adjacent ends of the sleeve sections 9d in such manner as to provide a continuous opening which communicates with the continuous recess 9B. A ring |03 is rotatably carried by the bearing sections |02 and has an integral inwardly projecting toothed ring |04 which engages the pinions |09. A worm gear ring |95 is connected to the outside of the ring |03. as shown at |96. A tray |08 is connected between the vertical uprights 9| of the bed 90 and supports a shaft |09 which is journaled for rotation therein. A worm ||9 is secured to the shaft |99 in such manner as to engage the worm gear ring |05 on the ring |93.

The shaft |09 is suitably driven to rotate the ring |03 with respect to the sleeve sections 99 and drive the pinions |00 on the shafts 99 by means of the inwardly projecting toothed ring |99.

A Worm gear ring ||5 is connected to one of the sleeve sections 99, as shown at IIB. A shaft I|'| is journaled in the tray |09 and has secured thereto a worm I I8 which engages the worm gear ring II5. The shaft I Il' is suitably driven to rotate the connected sleeve sections Sli through the worm gear ring II5.

An extension |23 is connected, as at |29, to the outside end of each of the sleeve sections 9d, and each is provided with a pair of diagonally opposed boss portions |25, which are radially apertured as at |26. A shaft |21 is slidably disposed in each of the apertures |29 and each carries on its radially inward end a frame |28. A shaft |29 is journaled in each of the frames |28 and each carries a rotary brush |39 Whose outside is preferably but not necessarily concaved in the direction of its axis of rotation. A setscrew |3| is threaded into each of the boss portions |25 of the sleeve extensions |23 to secure the shafts |21 in 70 These exible driving connections |33 are thus '15 operated by the shaft its carrying the worm Ill, and the alined sleeve sections 94 are rotated by the shaft carrying the worm yIII. A conical shroud |34 is assembled around the sleeve sections 94 and provided at each of its ends with an aperture |35.

Referring to Figure 6 of the drawings, an annular rubber wipe |36 is disposedin the aperture Illwhich is intended as theintroductory opening of the apparatus of the invention. In addition, a similar wipe |31 inner ends of the inwardly extending rings 95 of the sleeve sections 9 4. A series of coils |38 are mounted within the cylindrical lshroud |34 im- 'mediately adjacent the opening |35 which is provided with the wipe |36. A plurality of inwardly projecting spray nozzles |39 are provided on the inner sides of the coils |38 and the latter supplied with coating medium through a suitable pipe (not shown) and under a satisfactorily regulated pressure. Y

A tray IM is disposed between the spaced uprights 9| for the purpose of catching and retaining superfluous coating medium, which is indicated at III.

Whichever embodiment of the device of the lnvention is used, a very uniform and thin nlm of coating medium will be provided on the outside of the work-piece X. If the work-piece X is susceptible to ceiling, or reeling, the rolls yB'I and 1.5 and the pinch rolls 62 and 12 may be dispensed with, or modified, to accommodate such a mode of handling.

While we have shown and described severalembodiments of our invention, it is to be understood that we do not wish to be limited exactly thereto, since various modifications may be made without departing from the scope of our inven-v tion, as dened by the following claims.

We claim:

1. A coating apparatus comprising, in combi# nation, a sectional and rotatable drum, at least one brush carried on the inside of said sectional is securedto the said ilegible driving connection.

and rotatable drum in a radially adjustable manner, meansfor rotating said drum, at least one rotatable shaft carried by said drum, a flexible driving connection between said brush and said rotatable shaft.' means for rotating said rotatable l5` shaft through said flexible driving connection, means for applying a coating medium to a workpiece, means for moving said work-piecel through saidrotatable drum and in contact with said brush. anda shroud for enclosing said rotatable 10 drum and said means for applying a coating medium, said shroud having apertures to permit the movement of said work-piece therethrough. -2. A coating apparatus comprising, in combination, a vertically adjustable support, a sectional and rotatable drum horizontally mounted on said support. at least .one brush carried on the inside of said sectional and rotatable drum in a radially adjustable manner, means for rotating said drum, at least one rotatable shaft 20 carried by said drum, a flexible driving connection between said brush and said rotatable shaft., means forrotating said rotatable shaft through said flexible driving connection, means for applying a coating medium to a workpiece,means 25 for moving said work-piece through said rotatable drum and in contact with said brush, and

a shroudtfor enclosing said rotatable drum and said meaps for applying a coating medium, said shroud having aperturesto permit the movement 30 of said work-piece therethrough.

3. A cbating apparatus comprising, in combination, ,a rotatable drum, at least one brush carried gn the inside of said rotatabledrum in a radially adjustable manner, means for rotating 35 said drum, at least one rotatable shaft carried by said a flexible driving connection between" brush and said rotatable shaft, and means for rotating said rotatable shaft through JOHN J. BOAX. JOHN A. MILLER. 

